Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53fb4980be53f0c…

MALICIOUS

PDF

79.4 KB
MD5: 2683a0e54176eee055795fda0a078152 SHA-1: 4677e1faef06bc3fbee45623321473abd7880bb5 SHA-256: f53fb4980be53f0c32d30eb17b7692e971e42f4a549904d0a6b9d745989057c9
120 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious File T1566.002 Phishing: Spearphishing Attachment

The PDF was flagged by multiple high-confidence heuristics, including ML and ClamAV, indicating it contains an exploit. The presence of an XFA form and an embedded script payload strongly suggests it's designed to execute malicious code. The embedded script is likely responsible for downloading and executing a second-stage payload, though its exact functionality is obscured by the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • ClamAV: Pdf.Exploit.Agent-6136306-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-6136306-0
  • Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_0000023c.bin
2895e98d301c7d67ef6b8b817937c8c8c5dc8e9a1fdb037571501dd310a875df
pdf-embedded-script PDF raw stream script payload at offset 0x23C 80624 bytes